Malicious PDF — malware analysis report

Static analysis result for SHA-256 4581e4163d82976c…

MALICIOUS

PDF

37.0 KB Created: 2020-04-07 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0a776659509c3683e5ba7559f727bdc SHA-1: f6a0e6210e0d19394e3b6cced9d21050ed79e3d7 SHA-256: 4581e4163d82976c4776e7beebf55266e45b6577960b8e82db1d242996f5082f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tourstravels.org/uploads/1/3/0/5/130551095/130551095.html#sony+bd+rmt-b119a+remote
    • http://buywaterfordhomes.com/uploads/1/3/0/6/130639419/8339809.pdf
    • http://momsguidetodisney.com/uploads/1/3/0/6/130604863/68c119150.pdf
    • http://sandnpinesrabbitry.com/uploads/1/3/0/8/130814597/43b8f741.pdf
    • http://shoproyaltywear.com/uploads/1/3/0/5/130551051/17c3888ed78dd.pdf
    • http://vivereinbulgaria.it/uploads/1/3/0/8/130873894/5583867.pdf
    • http://emilytiberio.com/uploads/1/3/0/6/130605498/50fb1d04541212d.pdf
    • http://3dflooringepoxy.com/uploads/1/3/0/6/130621486/3060303.pdf
    • http://moorewalkinghorses.com/uploads/1/3/0/4/130475909/49697e42f774a11.pdf
    • http://mlrosynek.com/uploads/1/3/0/6/130604950/tezotewebovagirigoki.pdf
    • http://jozildapozzo.com/uploads/1/3/0/5/130548108/e92d367bc933eb.pdf
    • http://valssalon.com/uploads/1/3/0/7/130738798/ralunelexepijedetab.pdf
    • http://sophiacdesign.com/uploads/1/3/0/8/130874371/ecf98e29958ac9.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000658e.bin
5cca23029e6351a736fe8064f872028a39fd2c2161a97028b3c68345ee5b4cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 8704 bytes

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